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特性
- Robust Protection Reduces System Downtime
- Wide Input Supply Range: +3V to +80V (without Reverse Current Protection)
- Wide Input Supply Range: +3V to +75V (with Reverse Current Protection)
- ±3% Accurate Programmable Current Limit between 3A to 7A across Full Temperature Range
- ±4% Accurate Programmable Current Limit between 2A to 3A across Full Temperature Range
- ±7% Accurate Programmable Current Limit between 0.7A to 2A across Full Temperature Range
- ±6% Accurate Power Limit at 100W, 24V for
- Class 2 Applications
- Input-Voltage Reverse-Polarity Protection (with External nFET)
- Dual Stage Reverse Current Protection (with External nFET) with Fast 100ns Response Time
- Low RON Internal nFET (20mΩ typ)
- Output-Voltage Reverse-Polarity Tolerant
- Loss of Ground Protection
- 200% Short Term Overload capability
- Programmable Overvoltage Surge Protection (MAX17617A)
- Flexible Design to Maximize Reuse and Minimize Requalification
- Adjustable UVLO and OVLO/OVFB Thresholds
- ±2% Accurate Bandwidth Current Monitoring Read-Out, IMON (3A to 7A, up to +85ºC)
- Programmable Startup Inrush Current Limit
- Programmable Current Limit Fault Response: Continuous, Autoretry, and Latch-off Modes
- Logic Level Enable Input (EN)
- Protected External N-type Field Effect Transistor (nFET) Gate Drive
- Open Drain Fault Indicator (FLAG)
- Power Good Output (PGOOD)
- Programmable Output Under Voltage Sense (OUTUV)
- Junction Temperature Monitoring (TJ)
- Thermal Foldback Current Limit
- Reduced Solution Footprint
- 4.5mm x 5.75mm, 23-Pin FCQFN package
- Integrated nFET for Common-Use Protection Requiremen
产品详情和应用
The MAX17617/MAX17617A offers highly versatile and programmable protection boundaries for systems against input voltage faults and output overcurrent faults. In addition, MAX17617/MAX17617A offers a programmable power limiting function. Input-voltage faults (with positive polarity) are protected up to +80V (without Reverse Current Protection)/+75V (with Reverse Current Protection), by an internal nFET featuring low ON-resistance (20mΩ typ). The devices feature a programmable undervoltage-lockout (UVLO) thresholds by using external voltage-dividers. The MAX17617 features a programmable overvoltage-lockout (OVLO) while MAX17617A offers a programmable output voltage clamp function through the OVFB pin that features an output voltage limiting regulation during input transient surge events. Input undervoltage and overvoltage protection (MAX17617)/output voltage clamp function (MAX17617A) can be programmed across the entire 3V to 80V operating range.
Input reverse-polarity protection is realized using an external nFET that is controlled by the devices. The magnitude of reverse-polarity voltage protection is dependent on the operating load-bus voltage (VOUT) and the voltage-blocking capability of the external nFET. For example, for protection down to a -55V input range with VOUT = 30V, an external nFET rated at 85V is needed. The external nFET is also needed for the optional reverse-current protection. When used with a Reverse Protection external nFET (Q1), the devices prevent reverse current flow from load to source by turning off Q1. The reverse current thresholds and forward bias characteristics of the reverse current protection feature are tuned to achieve an ideal diode function suited for OR-ing and Power Multiplexer applications. If reverse polarity protection and reverse-current protection are not needed, SN and GN pins must be connected to IN. The devices are tolerant against accidental o
